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Bearing steel heat treatment process can be roughly divided into the overall heat treatment, surface heat treating and chemical treating three categories. According to the heating medium, heating temperature and the cooling method is different, each class can be divided into a number of different heat treatment process. Different heat treatment processes with a bearing steel, available in different organizations, thereby having different properties. Steel bearing steel industry is the most widely used, and the microstructure of iron and steel is the most complicated, so many kinds of steel heat treatment process.
The overall heat treatment is heating the whole piece, and then at the appropriate rate of cooling, in bearing steel heat treatment process to change its overall mechanical properties of the. Heat treatment of steel as a whole there are four basic process of annealing, normalizing, quenching and tempering.
Annealing is the workpiece heated to the appropriate temperature, according to the material and the size of the workpiece with different holding time, then slowly cooled, the purpose is to make the bearing steel internal organization at or near equilibrium, obtain good process performance and use of performance, or for further quenching organization preparation.
Normalizing is the workpiece heated to proper temperature after cooling in the air, the effect of normalizing same with annealing, the organization only get more details, materials commonly used to improve the cutting performance, are also sometimes used for some less demanding parts as the final heat treatment.
Quenching is the workpiece after heat insulation, rapid cooling in the water, oil or other inorganic salts, organic aqueous quenching medium. Quenched steel hardened, but brittle.